bio aa final document_v1
TRANSCRIPT
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Lee Hui Min, Sarah Wong, Chang Jie Lin, Yap Lay Sheng, Goh Rui Zhe
Triglyceride
The diagram depicts an enlarged
ball and stick model of the triglyceride.
It depicts each atom in the molecule
using an approximation of the sizes of
the C, O, and H atoms. Also, the model is
done for a hydrocarbon tail of 12 carbon
atoms long. The main features of a
triglyceride molecule include the 1)
glycerol 2) 3 fatty acids/hydrocarbon
tails 3) Ester linkage between the
glycerol and the 3 fatty acids via a
condensation reaction.
The white tack represents the
carbon atoms; the blue tack represents
the oxygen atoms and the black tack
represents the hydrogen atoms. The
bends on the straws represent the kinks
formed in the hydrocarbon chain as a
result of the double bonds between two
carbon atoms. The paper clips
connecting the blue tack and the white
tack represents the ester linkage (o=c-o-
c) the double bond between the oxygen
and the carbon is also depicted.
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Lee Hui Min, Sarah Wong, Chang Jie Lin, Yap Lay Sheng, Goh Rui Zhe
Phospholipid (Micro Illustration)
This is an enlarged model
of a single phospholipid molecule.
It depicts each atom in the
molecule (using an approximation
of the sizes of the C, O, H atoms,
along with the phosphate group).
The covalent bonds between each
atom are represented by a blue
straw, and the double bonds
represented by two blue straws.
A phospholipid consists of
one glycerol and two fatty acids
that are bonded together by two
ester linkages. The third OH of
glycerol is joined to a negatively
charged phosphate group by a
phosphoester linkage. Additonal
small molecules, represented by a
pink-coloured ball, can be linked to
the phosphate group to form a
variety of phospholipids, and
usually give rise to the hydrophilic
property of the phospholipids.
This is because the small molecule
is charged or polar itself. The
hydrocarbon tail contains 12
carbon atoms (the big red ball
representing carbon, while a much
smaller yellow ball represents
oxygen). The hydrocarbon tail of the model is saturated.
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Lee Hui Min, Sarah Wong, Chang Jie Lin, Yap Lay Sheng, Goh Rui Zhe
Phospholipid Bilayer (Macro Illustration)
This model depicts a representation of a phopholipid bilayer. The hydrophilic heads of
the phospholipid layers are represented by sponges while the hydrophobic tails are represented
by toothpicks. Two distinct layer of liquids are shown, the hydrophilic head in contact with an
aqueous environment, while the hydrophobic tails in contact with oil in the non-polar interior of
the bilayer. A lipid bilayer is a two-dimensional sheet formed by the combination of two lipid
monolayers. The hydrophilic heads, facing outwards, are exposed to the polar surroundings, or
surrounding water, while the hydrophobic tails, facing inwards, are shielded from water in the
non-polar interior of the bilayer.